The Astro gets a lot of love on here and online in general, it seems. My experience was not so positive. I bought mine from a friend who was the second owner, at about 90K. I had complete service records, and I had no reason to believe the van was ever abused. It did operate in the near suburban Chicago environment, which is very hard on any vehicle-extreme temps, snow, lots of salt, bad, bad traffic.
I never got the great mileage some people report. I averaged about 15MPG in mixed driving, and never saw 20 on the highway, and I'm a conservative driver. Reliability was very poor in general, both for me and the previous owners. An amazing amount of things went wrong with this van. Handling was poor in general and, as I wrote in your other post on winter driving, bad in the snow and ice.
Maybe mine was just a lemon, and an anomaly, but just want you to know that the reality of this vehicle may not be as wonderful as some make it out to be.